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Abstract <p> A&#xa0;fluorescence “turn-off-on” nanoprobe is designed by using europium-doped strontium molybdate perovskite quantum dots (Eu<sup>3+</sup>:SMO PQDs) for the sequential detection of hypoxanthine (Hx) and&#xa0;Fe<sup>3+</sup>. The Eu<sup>3+</sup>:SMO PQDs were prepared by the sol-gel method using Sr(NO<sub>3</sub>)<sub>2</sub>, (NH<sub>4</sub>)<sub>6</sub>Mo<sub>7</sub>O<sub>24</sub>.4H<sub>2</sub>O, and Eu(OCOCH<sub>3</sub>)<sub>3</sub> as precursors. The green fluorescence of Eu<sup>3+</sup>:SMO PQDs was efficiently reduced (turn-off) in the presence of Hx, then it was restored (turn-on) gradually by introducing Fe<sup>3+</sup> due to the competitive formation of Hx@Fe<sup>3+</sup>, which results to the release of Eu<sup>3+</sup>:SMO PQDs. In addition, the fluorescent probe exhibits excellent selectivity and sensitivity. Under the optimized experimental conditions, linear ranges and detection limits were 0.25–25 μM and 12.30 nM for Hx and 0.025–50 μM and 10.44 nM for Fe<sup>3+</sup> , respectively. Furthermore, the fluorescence method was successfully explored to detect Hx and Fe<sup>3+</sup> in plasma and urine samples.</p> Graphical abstract <p></p>

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Eu3+-ion doped strontium molybdate perovskite quantum dots as a turn-off-on fluorescent sensor for simultaneous detection of hypoxanthine biomarker and Fe3+ ions

  • 期刊论文

  • 发表日期：

    2025年1月11日

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  • Mayurkumar Revabhai Patel,
  • Hirakendu Basu,
  • Tae Jung Park,
  • Suresh Kumar Kailasa

摘要

Abstract

A fluorescence “turn-off-on” nanoprobe is designed by using europium-doped strontium molybdate perovskite quantum dots (Eu3+:SMO PQDs) for the sequential detection of hypoxanthine (Hx) and Fe3+. The Eu3+:SMO PQDs were prepared by the sol-gel method using Sr(NO3)2, (NH4)6Mo7O24.4H2O, and Eu(OCOCH3)3 as precursors. The green fluorescence of Eu3+:SMO PQDs was efficiently reduced (turn-off) in the presence of Hx, then it was restored (turn-on) gradually by introducing Fe3+ due to the competitive formation of Hx@Fe3+, which results to the release of Eu3+:SMO PQDs. In addition, the fluorescent probe exhibits excellent selectivity and sensitivity. Under the optimized experimental conditions, linear ranges and detection limits were 0.25–25 μM and 12.30 nM for Hx and 0.025–50 μM and 10.44 nM for Fe3+ , respectively. Furthermore, the fluorescence method was successfully explored to detect Hx and Fe3+ in plasma and urine samples.

Graphical abstract